drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c

   1 /*
   2  * Copyright 2015 Freescale Semiconductor, Inc.
   3  *
   4  * Freescale DCU drm device driver
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/clk-provider.h>
  14 #include <linux/console.h>
  15 #include <linux/io.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <linux/mm.h>
  18 #include <linux/module.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/regmap.h>
  24
  25 #include <drm/drmP.h>
  26 #include <drm/drm_atomic_helper.h>
  27 #include <drm/drm_fb_cma_helper.h>
  28 #include <drm/drm_fb_helper.h>
  29 #include <drm/drm_gem_cma_helper.h>
  30 #include <drm/drm_modeset_helper.h>
  31 #include <drm/drm_probe_helper.h>
  32
  33 #include "fsl_dcu_drm_crtc.h"
  34 #include "fsl_dcu_drm_drv.h"
  35 #include "fsl_tcon.h"
  36
  37 static int legacyfb_depth = 24;
  38 module_param(legacyfb_depth, int, 0444);
  39
  40 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
  41 {
  42         if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
  43                 return true;
  44
  45         return false;
  46 }
  47
  48 static const struct regmap_config fsl_dcu_regmap_config = {
  49         .reg_bits = 32,
  50         .reg_stride = 4,
  51         .val_bits = 32,
  52
  53         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  54 };
  55
  56 static void fsl_dcu_irq_uninstall(struct drm_device *dev)
  57 {
  58         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  59
  60         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
  61         regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
  62 }
  63
  64 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
  65 {
  66         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  67         int ret;
  68
  69         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  70         if (ret < 0) {
  71                 dev_err(dev->dev, "failed to initialize mode setting\n");
  72                 return ret;
  73         }
  74
  75         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
  76         if (ret < 0) {
  77                 dev_err(dev->dev, "failed to initialize vblank\n");
  78                 goto done;
  79         }
  80
  81         ret = drm_irq_install(dev, fsl_dev->irq);
  82         if (ret < 0) {
  83                 dev_err(dev->dev, "failed to install IRQ handler\n");
  84                 goto done;
  85         }
  86
  87         if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
  88             legacyfb_depth != 32) {
  89                 dev_warn(dev->dev,
  90                         "Invalid legacyfb_depth.  Defaulting to 24bpp\n");
  91                 legacyfb_depth = 24;
  92         }
  93
  94         return 0;
  95 done:
  96         drm_kms_helper_poll_fini(dev);
  97
  98         drm_mode_config_cleanup(dev);
  99         drm_irq_uninstall(dev);
 100         dev->dev_private = NULL;
 101
 102         return ret;
 103 }
 104
 105 static void fsl_dcu_unload(struct drm_device *dev)
 106 {
 107         drm_atomic_helper_shutdown(dev);
 108         drm_kms_helper_poll_fini(dev);
 109
 110         drm_mode_config_cleanup(dev);
 111         drm_irq_uninstall(dev);
 112
 113         dev->dev_private = NULL;
 114 }
 115
 116 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 117 {
 118         struct drm_device *dev = arg;
 119         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 120         unsigned int int_status;
 121         int ret;
 122
 123         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 124         if (ret) {
 125                 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
 126                 return IRQ_NONE;
 127         }
 128
 129         if (int_status & DCU_INT_STATUS_VBLANK)
 130                 drm_handle_vblank(dev, 0);
 131
 132         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 133
 134         return IRQ_HANDLED;
 135 }
 136
 137 DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
 138
 139 static struct drm_driver fsl_dcu_drm_driver = {
 140         .driver_features        = DRIVER_GEM | DRIVER_MODESET
 141                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 142         .load                   = fsl_dcu_load,
 143         .unload                 = fsl_dcu_unload,
 144         .irq_handler            = fsl_dcu_drm_irq,
 145         .irq_preinstall         = fsl_dcu_irq_uninstall,
 146         .irq_uninstall          = fsl_dcu_irq_uninstall,
 147         .gem_free_object_unlocked = drm_gem_cma_free_object,
 148         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 149         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 150         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 151         .gem_prime_import       = drm_gem_prime_import,
 152         .gem_prime_export       = drm_gem_prime_export,
 153         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 154         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 155         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 156         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 157         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 158         .dumb_create            = drm_gem_cma_dumb_create,
 159         .fops                   = &fsl_dcu_drm_fops,
 160         .name                   = "fsl-dcu-drm",
 161         .desc                   = "Freescale DCU DRM",
 162         .date                   = "20160425",
 163         .major                  = 1,
 164         .minor                  = 1,
 165 };
 166
 167 #ifdef CONFIG_PM_SLEEP
 168 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 169 {
 170         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 171         int ret;
 172
 173         if (!fsl_dev)
 174                 return 0;
 175
 176         disable_irq(fsl_dev->irq);
 177
 178         ret = drm_mode_config_helper_suspend(fsl_dev->drm);
 179         if (ret) {
 180                 enable_irq(fsl_dev->irq);
 181                 return ret;
 182         }
 183
 184         clk_disable_unprepare(fsl_dev->clk);
 185
 186         return 0;
 187 }
 188
 189 static int fsl_dcu_drm_pm_resume(struct device *dev)
 190 {
 191         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 192         int ret;
 193
 194         if (!fsl_dev)
 195                 return 0;
 196
 197         ret = clk_prepare_enable(fsl_dev->clk);
 198         if (ret < 0) {
 199                 dev_err(dev, "failed to enable dcu clk\n");
 200                 return ret;
 201         }
 202
 203         if (fsl_dev->tcon)
 204                 fsl_tcon_bypass_enable(fsl_dev->tcon);
 205         fsl_dcu_drm_init_planes(fsl_dev->drm);
 206         enable_irq(fsl_dev->irq);
 207
 208         drm_mode_config_helper_resume(fsl_dev->drm);
 209
 210         return 0;
 211 }
 212 #endif
 213
 214 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 215         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 216 };
 217
 218 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 219         .name = "ls1021a",
 220         .total_layer = 16,
 221         .max_layer = 4,
 222         .layer_regs = LS1021A_LAYER_REG_NUM,
 223 };
 224
 225 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 226         .name = "vf610",
 227         .total_layer = 64,
 228         .max_layer = 6,
 229         .layer_regs = VF610_LAYER_REG_NUM,
 230 };
 231
 232 static const struct of_device_id fsl_dcu_of_match[] = {
 233         {
 234                 .compatible = "fsl,ls1021a-dcu",
 235                 .data = &fsl_dcu_ls1021a_data,
 236         }, {
 237                 .compatible = "fsl,vf610-dcu",
 238                 .data = &fsl_dcu_vf610_data,
 239         }, {
 240         },
 241 };
 242 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 243
 244 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 245 {
 246         struct fsl_dcu_drm_device *fsl_dev;
 247         struct drm_device *drm;
 248         struct device *dev = &pdev->dev;
 249         struct resource *res;
 250         void __iomem *base;
 251         struct drm_driver *driver = &fsl_dcu_drm_driver;
 252         struct clk *pix_clk_in;
 253         char pix_clk_name[32];
 254         const char *pix_clk_in_name;
 255         const struct of_device_id *id;
 256         int ret;
 257         u8 div_ratio_shift = 0;
 258
 259         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 260         if (!fsl_dev)
 261                 return -ENOMEM;
 262
 263         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 264         if (!id)
 265                 return -ENODEV;
 266         fsl_dev->soc = id->data;
 267
 268         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 269         base = devm_ioremap_resource(dev, res);
 270         if (IS_ERR(base)) {
 271                 ret = PTR_ERR(base);
 272                 return ret;
 273         }
 274
 275         fsl_dev->irq = platform_get_irq(pdev, 0);
 276         if (fsl_dev->irq < 0) {
 277                 dev_err(dev, "failed to get irq\n");
 278                 return fsl_dev->irq;
 279         }
 280
 281         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 282                         &fsl_dcu_regmap_config);
 283         if (IS_ERR(fsl_dev->regmap)) {
 284                 dev_err(dev, "regmap init failed\n");
 285                 return PTR_ERR(fsl_dev->regmap);
 286         }
 287
 288         fsl_dev->clk = devm_clk_get(dev, "dcu");
 289         if (IS_ERR(fsl_dev->clk)) {
 290                 dev_err(dev, "failed to get dcu clock\n");
 291                 return PTR_ERR(fsl_dev->clk);
 292         }
 293         ret = clk_prepare_enable(fsl_dev->clk);
 294         if (ret < 0) {
 295                 dev_err(dev, "failed to enable dcu clk\n");
 296                 return ret;
 297         }
 298
 299         pix_clk_in = devm_clk_get(dev, "pix");
 300         if (IS_ERR(pix_clk_in)) {
 301                 /* legancy binding, use dcu clock as pixel clock input */
 302                 pix_clk_in = fsl_dev->clk;
 303         }
 304
 305         if (of_property_read_bool(dev->of_node, "big-endian"))
 306                 div_ratio_shift = 24;
 307
 308         pix_clk_in_name = __clk_get_name(pix_clk_in);
 309         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 310         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 311                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 312                         div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 313         if (IS_ERR(fsl_dev->pix_clk)) {
 314                 dev_err(dev, "failed to register pix clk\n");
 315                 ret = PTR_ERR(fsl_dev->pix_clk);
 316                 goto disable_clk;
 317         }
 318
 319         fsl_dev->tcon = fsl_tcon_init(dev);
 320
 321         drm = drm_dev_alloc(driver, dev);
 322         if (IS_ERR(drm)) {
 323                 ret = PTR_ERR(drm);
 324                 goto unregister_pix_clk;
 325         }
 326
 327         fsl_dev->dev = dev;
 328         fsl_dev->drm = drm;
 329         fsl_dev->np = dev->of_node;
 330         drm->dev_private = fsl_dev;
 331         dev_set_drvdata(dev, fsl_dev);
 332
 333         ret = drm_dev_register(drm, 0);
 334         if (ret < 0)
 335                 goto put;
 336
 337         drm_fbdev_generic_setup(drm, legacyfb_depth);
 338
 339         return 0;
 340
 341 put:
 342         drm_dev_put(drm);
 343 unregister_pix_clk:
 344         clk_unregister(fsl_dev->pix_clk);
 345 disable_clk:
 346         clk_disable_unprepare(fsl_dev->clk);
 347         return ret;
 348 }
 349
 350 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 351 {
 352         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 353
 354         drm_dev_unregister(fsl_dev->drm);
 355         drm_dev_put(fsl_dev->drm);
 356         clk_disable_unprepare(fsl_dev->clk);
 357         clk_unregister(fsl_dev->pix_clk);
 358
 359         return 0;
 360 }
 361
 362 static struct platform_driver fsl_dcu_drm_platform_driver = {
 363         .probe          = fsl_dcu_drm_probe,
 364         .remove         = fsl_dcu_drm_remove,
 365         .driver         = {
 366                 .name   = "fsl-dcu",
 367                 .pm     = &fsl_dcu_drm_pm_ops,
 368                 .of_match_table = fsl_dcu_of_match,
 369         },
 370 };
 371
 372 module_platform_driver(fsl_dcu_drm_platform_driver);
 373
 374 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 375 MODULE_LICENSE("GPL");